Sp3-rich porous carbon for doublet layer supercapacitors

In the foreseeable future, supercapacitors would be the most promising option for energy storage applications. But their widespread use is limited by their low energy storage density and relatively high effective series resistance. To date, however, the highest energy density of a carbon-based solid-state supercapacitor is limited up to 139 Wh kg⁻¹. Here, we report a nitrogen doped sp³ -rich carbon materials-based doublet layer supercapacitors that demonstrated excellent energy density (218.4 Wh kg⁻¹) with excellent cycling stability. This simple approach to low-cost carbonaceous materials with unique architecture and functionality could be a promising alternative to fabrication of hetero atom doped carbon structures for making next generation high capacitive batteries and hence, high energy storage device.